Half the difference of 18 and a number n is equal to the sum of n and three. what is the value of n?

n=12

Explanation:

First you have to write out the equation for the problem.

(18+n)/2=n+3

To get rid of the fraction, multiply both sides by 2.

18+n=2n+6

Now subtract n and subtract 6 from both sides and you will have your answer.

12=n

n=4

Explanation:

(18-n)/2=n+3

2*((18-n)/2)=(n+3)*2

18-n=2n+6

  +n  +n

18    = 3n+6

-6             -6

12     =3n

÷3      ÷3

4=n

n=4

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